ILD Vibration studies Hiroshi Yamaoka (KEK) LCWS2010, Beijing, China, 26-30 March, 2010 2010 年 3 月 29 日 月曜日
Introduction QD0(700kg) BeamCAL(100kg) LHCAL(3000kg) Vibration properties of the ILD QD0 support system has been studied. LumiCAL(250kg ) ECAL(420kg) ANSYS model ILD00 model ILD QD0 support system 2010 年 3 月 29 日 月曜日
To improve vibration behavior; 3. Correct? We need to solve these issues. 2. Calculations Check consistency Static Modal 1. Design of stiff support structure P.S.D. 4. Vibration data CERN KEK Coherency? 5. Realistic data Allowable Amplitude: < 50nm(V) (Above 5Hz) < 300nm(H) 2010 年 3 月 29 日 月曜日
1. Design stiff support structure New proposal: Double tube @LCWS09 fixed or support bracket inner tube Titanium outer tube K V K V K H Outer tube is fixed to these plates. K H (Vertical plates and bottom plate) 1000kg 4000kg 1000kg - Spring constant 4000x(w/650) 2 kg - Static loads Self-weight are defined. Allowable Amplitude: < 50nm(V) (Above 5Hz) < 300nm(H) Integ. amplitude in cases of ATF and CERN high-noise are larger than 50nm at f > 5Hz. ( ATF/KEKB and CERN have GM integrated amplitude of ~ 20nm at f > 5Hz. ) Double tube is proposed. - Support tube consists of double square tube. - Outer tube supports FCAL. - Inner tube supports QD0. 2010 年 3 月 29 日 月曜日
- Outer dimensions of 600x600mm - 25mm thick 2010 年 3 月 29 日 月曜日
Thicker Calculation-3 200t 400t Additional ribs 1.3mm(inner) 31Hz(1 st mode) 3.8mm(Outer) 8.6Hz(1 st mode) Inner cylinder: 54nm @ f>5Hz Self-weight + 1,000kg(QD0) Outer cylinder: 4,000kg 0.6nm @ f>5Hz Fixed Integ. Amp. P.S.D. 6 2010 年 3 月 29 日 月曜日
Calculation-1 Calculation-2 Fixed Add: Support bracket Fixed Calculation-3 Thicker 200t 400t Additional ribs Fixed 2010 年 3 月 29 日 月曜日
3. Investigation of consistency between the calculations and measurements input measured LION LS10C Servo accelerometer 0.3V=1m/s 2 DC~40Hz <10 -5 m/s 2 Al: t5x50x570L Measurement Calculation 8 Are those values same? 2010 年 3 月 29 日 月曜日
Results: Comparison PSD/Amplitude. Measurement 16Hz: Resonant freq. Input damping ratio=2% 9 � - 1 st mode of resonant frequency is ~6Hz different. i.e. not perfect fixing - Amplitude is ~100nm different. 2010 年 3 月 29 日 月曜日
Vibration measurements at the Belle/KEKB Study items Belle detector ~1,300 t - Vibrations on each place - Coherency between both sides Measure vibrations on the Belle ? ? ? ? ? Coherency between A - B Measure vibrations on KEKB ? ? A B ? ? 2010 年 3 月 29 日 月曜日
4. Vibration data@KEK Servo Accelerometer ＭＧ‐１０２ Acc. 0.1 ～ 400Hz Acc. 60dB = 1gal/V 2010 年 3 月 29 日 月曜日
196nm 248nm 301nm 354nm 93nm 80nm 18nm 25nm 12nm 17nm 9nm 20nm 204nm 254nm 121nm 14nm 27nm 19nm 67nm 102nm 52nm 68nm 82nm 72nm 10nm 3nm 12nm 2nm 9nm 8nm 12 2010 年 3 月 29 日 月曜日
Considerations on the measurement results - First resonance is around ~3-4Hz. - Amplitude on the barrel is bigger than the table. - Amplitudes on the End-Y becomes larger as the position of EY rises. 150tonnes Spherical support Large amplitudes on the Belle; - The belle detector is not fixed on the floor. - The barrel yoke is not fixed on the table rigidly. - Top of the end-yoke is not fixed. 2010 年 3 月 29 日 月曜日
Integrated amplitudes QC1RE QCS boat 241nm 77nm 52nm 112nm 50nm 46nm 250nm 60nm 15nm 118nm 21nm 30nm Movable table KEKB tunnel floor 90nm 10nm 50nm 12nm 5nm 76nm 16nm 9nm 19nm 55nm 45nm 68nm 2010 年 3 月 29 日 月曜日
Frequency (Hz) Coherency Frequency (Hz) Frequency (Hz) Coherency X (perpendicular to beam) Y(beam) Z(vertical) Coherency Coherency measurement at KEKB-tunnel Belle detector ~1,300 t A B Coherency between positions A and B It seems that there is no coherency between two positions. Except for the frequency of microseismic(~0.5Hz) and resonance of soil(~3Hz). 2010 年 3 月 29 日 月曜日
Ring top 100 nm Ground Ring top Ring top Ground Ground Ground Ring top Measurements on ground and top of CMS-ring : by A. Herve Power Spectrum Density (PSD) m 2 /Hz Ver4cal Geophones Cooling system OFF Beam direc4on Power Spectrum Density (PSD) m 2 /Hz 2010 年 3 月 29 日 月曜日
Summary of vibration measurements at Belle, Vertical 56 30 90 180 Ring top 1.8 1.8 5 5 Ground Beam KEKB tunnel and CMS Vertical Beam >10Hz >10Hz > 1 Hz > 1 Hz Integrated amplitude (nm) Integrated amplitude (nm) Integrated amplitude (nm) Integrated amplitude (nm) CMS Belle 2010 年 3 月 29 日 月曜日
Acceleration during movement - Push-Pull Investigations of efficiency of detector support structure - Detector should be fixed to the floor ? or, Is it enough to just placed it on the floor ? Difference of vibration properties between fixed and un-fixed the yoke to the support bracket were measured. ND280 detector (Total: 1,100 t ) 2-16xM36 - The ND280 detector is fixed to the support- brackets with 2-16xM36 thread bolts . - The support bracket is designed to withstand against 0.5G seismic force . 2010 年 3 月 29 日 月曜日
Results EW NS Measurement position UD UD EW NS � - Natural frequency after fixed to the bracket is increased to ~1Hz(NS, UD). - P.S.D. is reduced because natural frequency is increased. � ! It is not so big different but it's efficient to use the support-brackets. 20 � ! Support stiffness is increased. 2010 年 3 月 29 日 月曜日
Vibration measurements during the detector moving Time data- On the roller (@South yoke) Yoke is Stopped. Piston arm is extending Yoke is moving. Yoke is pushing by the mover. Time data- On the support stand (@North yoke) ~1m/stroke, ~50cm/min Yoke is moving. Piston arm is extending Yoke is Stopped. Yoke is pushing by the mover. - Piezo-sensor couldn't detect these vibrations. 2010 年 3 月 29 日 月曜日
with damping factors (oil damper) Measurement results ( Response spectrum) On the roller: Rail dir. On the roller: Vertical During the moving During the moving yoke stopped Hydro system: ON Background Background On the Stand: Rail dir. On the Stand: Vertical During the moving During the moving yoke stopped Hydro system: ON Background Background 22 2010 年 3 月 29 日 月曜日
Summary 1. Design stiff support structure - Double shaped tube/Realistic tube have been proposed. - Integrated amplitude is less than 50nm. 2. Calculations - Static, modal and PSD have been carried out. 3. Check consistency - Simple vibration tests have been done. Resonant frequency was measured lower than ANSYS calculation. Measured integrated amplitude was larger than ANSYS calculation. 4. Vibration measurements Vibrations at the Belle detector/KEKB and CMS were measured. - Amplitude on the barrel yoke is bigger than the support table. - The integrated amplitude becomes larger when going from the bottom of the end yoke toward the top. 5. Realistic vibration data for calculations CMS data? 6. Other measurements (1) Efficiency of support structure was investigated with the ND280 detector. Support stiffness of the detector is increased. (2) Vibration measurement during the moving on the rail was carried out. Response acceleration was measured to 0.1G in rail direction, 0.01G in vertical. 2010 年 3 月 29 日 月曜日
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